KR100865151B1 - A injection molding machine and manufacture method of double molding product - Google Patents

Abstract

An injection molding machine for automatically producing a double molded product and a method for manufacturing the double molded product using the same are provided to maximize the workability by automatically and continuously producing a double molded product including at least two resins unblended with each other. An injection molding machine for automatically producing a double molded product comprises a circular rotating mold plate(20) disposed on a base(10) of an injection molding machine. Lower cores(32,33) are disposed on the top surface of the rotating mold plate in a circumferential direction and are used for injection molding a primary molded product. A movable mold plate(40) is disposed on the base so that the movable mold plate vertically moves through tie bars(50). A first upper core(60) is disposed at one side of the lower surface of the movable mold plate to form first cavity used for injection molding the primary molded product. A second upper core(70) is disposed at the other side of the lower surface of the movable mold plate while being spaced apart from the first upper core to form second cavity. A rotation driving device(80) rotates the rotating mold plate at an interval of 90°.

Description

Injection molding machine capable of automatic production of double molded products and manufacturing method of double molded products using same {A INJECTION MOLDING MACHINE AND MANUFACTURE METHOD OF DOUBLE MOLDING PRODUCT}

The present invention relates to an injection molding machine for producing a double molded article, and more particularly, an injection molding machine capable of automatically producing a double molded article capable of continuously injection molding a product through a heterogeneous resin that is not fused with each other, and a double molded article using the same. It relates to a manufacturing method.

In general, an injection molding machine is equipped with an upper mold and a lower mold in a mold clamping apparatus, and are formed to form a cavity that is the same as the shape of the product to be molded, and the molten resin is injected into the cavity at a high pressure. It is a device for molding.

In addition, double injection molding is a method in which two materials (or resins of different colors) are applied to one part to be injected, and two sets of molds are integrally installed in the molding apparatus of the injection molding machine, and the first molded product is first made through the primary mold. After injection molding, the mold is rotated 180 degrees by manpower so that secondary molding can be performed. Such a conventional double injection molding is applied to a variety of electronic products, household goods or mobile phones, in particular, the outer case of the electronic products such as mobile phones transparent synthetic resin (or transparent colored resin) for emitting the light emitted from the light emitting unit installed inside the device to the outside ) By primary injection molding, and then opaque inner resin secondary injection molding inside the primary injection resin, it is possible to produce a variety of functions and designs of the outer case.

However, in the conventional double injection molding method, one material is first injection molded and then moved to a new mold (secondary mold) by manpower, followed by injection molding of the remaining materials, so that the work process is complicated and the productivity is limited. There is.

On the other hand, the print layer may be integrally formed on the surface of the multi-injection molded article by placing (inserting) the film provided with the printing layer in the primary mold in advance. However, even in such a case, it is necessary to manually insert the film provided with the printing layer by hand, and there is a drawback in that workability is remarkably deteriorated since a dead work is required to remove the edge of the film exposed to the outside even after molding the product.

In addition, since the film fixing guide structure for insert fixing the film provided with the printing layer is additionally added to the primary mold, the injection mold configuration becomes complicated. In addition, since the conventional printing layer using the film is provided on the surface of the multi-injection molded article, even though the UV coating has a disadvantage that it can be easily erased by scratch or the like during the use of the product.

The present invention is to solve this problem; It is an object of the present invention to provide an injection molding machine capable of automatically producing a double-molded product that can maximize the productivity of work by automatically producing a double-molded product formed by combining two or more resins that are not fused together.

In addition, another object of the present invention is to form a printing layer directly on the inner surface of the first molded article forming the outer part of the molded article, thereby integrating the second molded article forming the inside of the double molded article while preventing the printing layer (drawing) from being erased during use of the product. It is to provide an injection molding machine capable of automatically producing a double-molded product.

In addition, another object of the present invention is an injection molding machine capable of automatic production of a double-molded article that can more solidly integrate the secondary molded article forming the inside of the double-molded product by applying an adhesive on the inner surface of the molded molded product forming the outer part of the molded article To provide.

In addition, an object of the present invention is to provide a method for producing a double molded article using an injection molding machine capable of maximizing work productivity by automatically producing a double molded article formed by combining two or more resins that are not fused together.

In addition, another object of the present invention is to form a printing layer directly on the inner surface of the first molded article forming the outer part of the molded article, thereby integrating the second molded article forming the inside of the double molded article while preventing the printing layer (drawing) from being erased during use of the product. It is to provide a method for producing a double molded article using an injection molding machine.

In addition, another object of the present invention is to apply a method for producing a double molded article using an injection molding machine that can more firmly integrate the secondary molded article forming the inside of the double molded article by applying an adhesive on the inner surface of the molded article forming the outside of the molded article. To provide.

Injection molding machine capable of automatic production of a double molded article according to the present invention for achieving this object; In the injection molding machine capable of automatic production of a double-molded product capable of continuously injection molding the double-molded article consisting of the outside and the inside through different dissimilar materials;

The injection molding machine; A circular rotating plate disposed on the base of the injection molding machine to be rotated 360 degrees by a turntable method; Four lower cores arranged in a circumferential direction to form an interval of 90 degrees from the upper surface of the rotatable plate and for injection molding the primary molded article forming the outside of the double molded article; A movable plate configured to move upward and downward through a tie bar at an upper portion of the base and to move through a cylinder unit; A first cavity disposed on one side of a bottom surface of the movable die and joined with a lower core facing one side of the bottom surface of the movable die among the lower cores when the movable die descends to form a first cavity for injection molding the primary molded product; 1 phase core; The second molded article disposed on the other side of the bottom of the movable die plate and spaced apart from the first phase core by a lower core facing the other side of the bottom die of the movable die to form the interior of the double molded article of the primary molded article A second phase core forming a second cavity for injection molding so as to be integral to the inner surface; Rotation driving means for rotating the rotatable plate at intervals of 90 degrees when the first and second phase cores are respectively joined to opposite lower cores and the first and second molded articles are molded and then opened; The first phase core and the lower core are combined to form the primary molded product, and the second phase core and the lower core are combined to form the secondary molded product, and are exposed to the lower core of the rotatable plate while being molded. Marking apparatus for printing the marking on the inner surface of the primary molded article; It is characterized by including.

In addition, the injection molding machine according to the present invention includes a print head for the marking device for printing the marking directly on the inner surface of the primary molded article; An adhesive nozzle for spray application of a transparent adhesive on an inner surface of the primary molded product; Hot air nozzle for hot air drying the inner surface of the primary molded product; It is characterized by including.

In addition, the injection molding machine according to the present invention is characterized in that the marking device is a laser marking machine for laser marking the pattern directly on the inner surface of the primary molded product.

In addition, the injection molding machine according to the present invention is characterized in that the marking device is a screen printing machine for directly screen printing the pattern on the inner surface of the primary molded product.

In addition, the injection molding machine according to the present invention is characterized in that the eject rod for dropping out the double molded article is provided when the secondary mold is molded on the second phase core and the movable mold is separated from the rotatable plate side.

In addition, the method for producing a double molded article using an injection molding machine according to the present invention; Four lower cores for injection molding the primary molded part forming the outer part of the double molded part are arranged in the circumferential direction with a 90 degree interval on the upper surface, and a rotating mold disposed rotatably by 360 degrees on the upper part of the base of the injection molding machine. and; A movable plate configured to move upward and downward through a tie bar at an upper portion of the base and to move through a cylinder unit; A first cavity disposed on one side of a bottom surface of the movable die and joined with a lower core facing one side of the bottom surface of the movable die among the lower cores when the movable die descends to form a first cavity for injection molding the primary molded product; 1 phase core; The second molded article disposed on the other side of the bottom of the movable die plate and spaced apart from the first phase core by a lower core facing the other side of the bottom die of the movable die to form the interior of the double molded article of the primary molded article A second phase core forming a second cavity for injection molding so as to be integral to the inner surface; Rotation driving means for rotating the rotatable plate at intervals of 90 degrees when the first and second phase cores are respectively joined to opposite lower cores and the first and second molded articles are molded and then opened; The first phase core and the lower core are combined to form the primary molded product, and the second phase core and the lower core are combined to form the secondary molded product, and are exposed to the lower core of the rotatable plate while being molded. Marking apparatus for printing the marking on the inner surface of the primary molded article; In the manufacturing method for continuously injection molding the double molded article through the injection molding machine provided;

Forming a first molded article of the movable die and a lower core disposed on the rotatable die by injection molding the primary molded article into the lower core; After the primary molded part molding step, the printing step of printing the marking on the inner surface of the primary molded part by rotating the rotary die 90 degrees by the rotation driving means so that the primary molded part is close to the marking device. Wow; After the pattern printing step, the rotary mold is rotated by 90 degrees to face the first molded article on which the pattern is printed with the second phase core of the movable plate, and then to form the second phase core. A secondary molded article molding step of inject-molding the second molded article forming the inside of the double molded article on the inner surface of the primary molded article; A molded article taking-out step of taking out the double molded article while separating the movable die from the rotatable plate after the secondary molded article forming step; It is characterized by including.

In addition, the double-molded article manufacturing method according to the present invention by molding the primary molded article by injecting a transparent molten resin into the first cavity formed between the first upper core and the lower core in the primary molded article molding step; The secondary molded article is molded by injecting an opaque molten resin into a second cavity formed between the second upper core and the lower core in the secondary molded article molding step.

In addition, the method for manufacturing a double molded article according to the present invention includes: an adhesive primary spraying step of spraying and applying a transparent adhesive to an inner surface of the primary molded article in the printing step; A pattern printing process of printing the pattern on the inner surface of the primary molded article after the adhesive primary spraying process; An adhesive secondary spraying step of spray-coating a transparent adhesive on an inner surface of the primary molded product after the pattern printing process; And a drying step of blowing hot air after the secondary spraying step to dry the inner surface of the primary molded product.

According to such an injection molding machine capable of automatic production of a double molded article according to the present invention and a method of manufacturing a double molded article using the same; Dual-molded products that combine two or more kinds of resins that are not fused to each other have the effect of maximizing the work productivity by automatically continuously producing the rotating molds having four cores rotated at 90 degree intervals.

In addition, since the printed layer is directly formed on the inner surface of the molded article forming the outer part of the molded article, the production workability can be enhanced, and the printed layer is formed on the inner surface of the primary molded article so that it is not erased during use. (In particular, since a separate molding operation is not required after the double-molded product is taken out, there is an advantage that the productivity can be significantly improved compared to the conventional one.)

In addition, by directly forming a transparent adhesive layer on the inner surface of the primary molded article, the secondary molded article constituting the inner surface of the double molded article has the advantage of more integrally molded on the inner surface of the primary molded article.

Next, a preferred embodiment according to the present invention configured as described above will be described in detail with reference to the accompanying drawings. Brief description of the accompanying drawings; 1 and 2 show the structure of a molded article molded through the injection molding machine according to the present invention, Figures 3 to 5 schematically show the structure of the injection molding machine according to the present invention. And Figure 6 is a block diagram showing a step-by-step manufacturing method of the double molded article according to the present invention, Figures 7 and 8 shows the operating state of the injection molding machine according to the present invention. (In the description of the present invention, the double molded article shows the front case of the MP-3 electronic product as an example.)

<Description of Injection Molding Machine Structure for Injection Molding of Double Molded Product According to the Present Invention>

First, referring to Figures 1 and 2, the double molded article (1) produced through the injection molding machine according to the present invention is molded through the primary mold injecting the transparent resin raw material of the first thickness of a predetermined thickness forming the outside of the molded article A molded layer 1a, a print layer 1c (print layer) formed by directly printing a marking device or letters or numbers to be expressed on the inner surface of the primary molded product 1a through a marking device, and an opaque resin through a secondary mold. It is divided into a secondary molded article 1b which is molded to be integrated with the inner surface of the primary molded article 1a as a raw material and forms the inside of the molded article. That is, the double molded article 1 is composed of a first molded article 1a layer made of transparent resin and a second molded article 1b layer made of opaque resin.

Injection molding machine according to the present invention for continuously producing such a double molded article (1) of the disc-shaped rotatably disposed 360 degrees in the turntable method on the base 10, as shown in Figure 3 and 4 Rotating lower cores 30 and 33 for injection molding primary molded articles 1a circumferentially formed on the upper surface of the rotary die 20 and forming a double molded article 1, and rotating The movable die plate 40 is disposed on the lower side of the base plate 10 to be moved back and forth from the upper portion of the base 10, and the base plate 20 is mounted on one side of the bottom surface of the movable die plate 40 for molding the primary molded product 1a. The first upper core 60 forming the first cavity and the secondary molded product 1b attached to the other side of the bottom surface of the movable mold 40 to form the double molded product 1 on the inner surface of the primary molded product 1a are integrally formed. A second phase core 70 or the like forming a second cavity for injection molding, each component of which The construction details are as follows.

First, referring to FIGS. 4 and 5, the disk-shaped rotating die 20 is disposed to be rotatable 360 degrees in a turntable manner through the rotating shaft 21 on the upper portion of the base 10, and in the circumferential direction. Each mold core can be detachably mounted. In addition, the disk-shaped rotary die 20 is programmed through the control panel 200 to rotate in one direction at intervals of 90 degrees while opening and closing the mold at a predetermined time (injection molding time) cycle, the rotary die 20 directly The rotation driving means 80 for rotating is also controlled to drive through the control panel 200. The rotation driving means 80 is provided in the base 10 of the injection molding machine, and this includes a reduction gear box for rotating the rotating shaft 21 of the rotating die 20 at intervals of 90 degrees by reducing the power of the motor. Equipped with. Therefore, the rotation driving means 80 is combined with the lower cores 30 and 32 to which the first and second phase cores 60 and 70 face each other so as to continuously injection molding the double molded article 1. After injection-molding the primary and secondary molded articles 1a and 1b, the rotary mold 20 is driven to rotate at an interval of 90 degrees (counterclockwise in the drawing).

The lower cores 30 to 33 are circumferentially mounted on the upper surface of the rotatable plate 20 to form a 90-degree gap. The primary cores 30 and 33 form a primary molded product that forms the outside of the double molded product 1 by being combined with the first upper core 60. It is for injection molding 1a). These lower cores 30 to 33 are all the same, and form the first cavity for forming the primary molded product 1a while being combined with the first upper core 60.

And with reference to FIGS. 3 and 4; The movable plate 40 is disposed on the base 10 of the injection molding machine so as to reciprocate up and down with the rotating plate 20 at the bottom thereof, and is reciprocated toward the upper surface of the rotating plate 20 through the cylinder unit 41. To be moved (see arrow directions in FIGS. 3 and 4). The two movable plate 40 is formed in a substantially quadrangular plate form, the tie bar 50 is penetrated through the corner corners of the reciprocating movement is guided. That is, the upper ends of the tie bars 50 are disposed to penetrate the edge of the movable die 40, and the lower ends of the tie bars 50 extend through the upper plate of the base 10 to the bottom. Therefore, the movable plate 40 is guided through the tie bars 50 by the driving of the cylinder unit 41 to be able to reciprocate precisely up and down on the base 10. (In the embodiment of the present invention, the movable die 40 has been described as reciprocating through a direct pressure mechanism that transmits direct pressure through the cylinder unit 41. However, the present invention is not limited thereto, and the movable die 40 is indirectly moved. It is a matter of course that a link mechanism that can be used can be applied.) To the movable die 40, a first pressure for supplying a molten resin for forming a primary molded article 1a and a secondary molded article 1b at a high pressure, respectively. , The second screw cylinder device (61, 71) is interlocked.

In addition, the first upper core 60 is mounted on one side of the bottom surface of the first movable plate 40 and faces one side of the bottom surface of the movable plate 40 among the lower cores 30 to 33 disposed on the rotating plate 20. The first cavity for injection molding the primary molded article 1a constituting the double molded article 1 by being combined with the lower core 30 is formed. The first cavity is supplied with molten resin through the first screw cylinder device 61 so that the primary molded product 1a is molded, which will be described in detail in the manufacturing process of the double molded product.

In addition, the second phase core 70 is mounted on the other side of the bottom surface of the movable die 40, and the primary molded product 1a is formed therein among the lower cores 30 to 33 disposed on the rotary die plate 20. To the core 32. That is, the second phase core 70 is integrated with the lower core 32 positioned at the opposite side thereof to integrate the secondary molded product 1b constituting the inside of the double molded product 1 with the inner surface of the primary molded product 1a. The second cavity for injection molding is formed as much as possible. The second cavity is supplied with molten resin through the second screw cylinder device 71 to mold the secondary molded product 1b on the inner surface of the primary molded product 1a, which will be described in detail in the process of manufacturing a double molded product. . In addition, the second phase core 70, after forming the secondary molded product (1b) is ejected for ejecting and dropping the double-molded product (1) completed molding when the movable mold 40 is separated from the rotating mold 20 side The rod 72 is provided. This is preferably configured to take out the molded double molded article 1 from the lower core 32 in the process of separating the second phase core 70.

On the other hand, as shown in Figure 5, one side of the base 10 of the injection molding machine, the adhesive is applied to the inner surface of the primary molded product (1a) exposed in the state molded inside the lower core 31 of the rotating die 20 A marking device 100 is applied to apply and print mark 1c directly. The marking device 100 is formed by combining the first upper core 60 and the lower core 30 to form the primary molded product 1a, and the second upper core 70 and the lower core 32 to join the secondary. In the process of forming the molded product 1b, markings such as numbers or letters 1c (see FIG. 2) are printed on the inner surface of the semi-molded primary molded product 31 exposed in the state of being molded on the lower core 32 (printing). A printing nozzle 110 for directly printing and marking the design 1c on the inner surface of the primary molded product 1a, and an adhesive nozzle for spraying a transparent adhesive on the inner surface of the primary molded product 1a. 120 and a hot air nozzle 130 for hot air drying the inner surface of the primary molded product 1a. The transparent adhesive sprayed through the adhesive nozzle 120 is intended to more firmly integrate the primary and secondary molded products 1a and 1b, and the hot air nozzle 130 may be formed by the adhesive and the adhesive within a short time (2 to 5 seconds). It is for drying a pattern. In the embodiment of the present invention, the marking device 100 is composed of a laser marker capable of directly laser marking the design (1c) on the inner surface of the primary molded product (1a), but not limited to the inner surface of the primary molded product (1a) Of course, a screen printing machine capable of directly screen printing the pattern 1c can be applied. In addition, in the embodiment of the present invention, the adhesive nozzle 120 and the hot air nozzle 130 are illustrated as being integrally formed on the print head 110, but may be separately arranged and individually controlled.

<Description of the manufacturing process of the double molded article through the injection molding machine according to the present invention>

Next, a manufacturing process of injection molding the double molded article 1 through the injection molding machine according to the present invention configured as described above will be described with reference to FIGS. 6 to 8.

First, as shown in FIG. 6, the process of manufacturing a double molded article using an injection molding machine according to the present invention includes molding a first molded article 1a forming the outside of the double molded article 1 (S10). And, after the first molded article molding step (S10) and after the printing step (S20) to apply the adhesive (1d) (1e) to the inner surface of the primary molded product (1a) and to print the marking (1c), the first molded article Second molded article forming step (S30) for injection molding the secondary molded article (1b) inside the double molded article (1a) on the inner surface of (1a), and take-out step (S40) for taking out the double molded article (1) from the mold core Each step is described in detail as follows.

<First molded article molding step; S10>

First, as shown in FIG. 7, the movable die 40 is lowered toward the rotary die 20 through the cylinder unit 41 (see arrow direction in FIG. 7).

Accordingly, the first upper core 60 mounted on the movable mold 40 is formed to be molded into the lower core 30 at the position facing the movable plate 40 to inject the primary molded product 1a that forms the outside of the double molded product 1. One cavity is formed. The first cavity 1 is molded into the lower core 30 by injecting transparent molten resin (transparent ABS resin or transparent acrylic resin, etc.) at a high pressure through the first screw cylinder device 61. do.

The primary molded product 1a faces the marking apparatus 100 in a state of being positioned inside the lower core 30 when the rotating die 20 is rotated 90 degrees.

<Printing step; S20>

In addition, the first upper core 60 and the lower core 30 are joined together to form the primary molded product 1a and exposed in a state formed in the lower core 31 of the wall of the rotating die 20. Applying an adhesive on the inner surface of the primary molded product 1a (in the embodiment of the present invention, the adhesive applied HOT MELT that melts easily when heated) and simultaneously printing and marking the design 1c such as numbers or letters. do.

That is, the printing step (S20) is molded in the lower core 31 and sprayed a transparent adhesive through the adhesive nozzle 120 of the marking device 100 on the inner surface of the first molded article 1a in a semi-cured state to fine adhesive The process of forming the layer 1d first (adhesive primary spraying process S21) and the print head 110 of the marking apparatus 100 on the inner surface of the primary molded product 1a, that is, the primary adhesive layer 1d Direct printing and marking of the design 1c (design printing process; S22) and the transparent adhesive is sprayed on the inner surface of the primary molded product 1a on which the design 1c is printed to form a fine adhesive layer 1e secondarily. Process (adhesive secondary spraying step: S23) and hot air (70-80 ° C.) forcibly blown through the hot air nozzle 130 of the marking device 100 to dry the inner surface of the primary molded product 1 a by rapid drying ( Drying step; S24).

Thus, forming the adhesive layer (1d) (1e) before and after the printing process (S22) and performing the drying step (S24) is the design 1c and the secondary molded product (1b) on the inner surface of the primary molded product (1a) ) Is to integrate more solidly. In addition, the above-described adhesive primary spraying step (S21), print printing step (S22), adhesive secondary spraying step (S23), and drying step using hot air (S24) is the first phase core (60) Through the injection molding the primary molded product (1a) (30 ~ 40 seconds) is made at a high speed.

<Second molded article forming step; S30>

As described above, the primary molded product 1a having the printed design 1c directly printed on the inner surface thereof is positioned in the lower core 31 when the rotating mold 20 is rotated 90 degrees. Will face.

Therefore, at the same time as the primary molded product 1a forming and the design 1c marking process; The second phase core 70 mounted on the movable mold 50 is molded into the lower core 32 at the position facing the movable plate 50 to form the second molded article 1b for injection molding the second molded article 1b. It will form a cavity. At this time, in the lower core 32 to be mated with the second phase core 70, the primary molded product 1a is already molded therein by being combined with the first phase core 60.

Accordingly, the second phase core 70 forms a second cavity for injection molding so that the secondary molded product 1b constituting the inside of the double molded product 1 is integrated with the inner surface of the primary molded product 1a. The second cavity is injected into the second cavity at high pressure through the second screw cylinder device 71, where the secondary molded product 1b is integrally formed on the inner surface of the primary molded product 1a on which the pattern 1c is printed. Molded.

On the other hand, in the secondary molded article molding step (S30) shown in FIG. 6, although the transparent adhesive layer (1d) (1e) is shown between the primary molded article (1a) and the secondary molded article (1b), substantially the primary molded article (1a) While the secondary molded product 1b is integrally molded on the inner surface, the transparent adhesive layers 1d and 1e are also melt-integrated and become invisible to the naked eye.

<Molded product take-out step; S40>

As shown in FIG. 8, when the first phase core 60 and the second phase core 70 are separated from the rotatable plate 20 side, the molded double molded product 1 is completed from the lower core 32. As the ejecting rod 72 provided in the second phase core 70 exits and protrudes to fall out, the double molded product 1 can be obtained.

In addition, the lower core 32, from which the double-molded product 1 escapes and is empty, is positioned in a standby state (empty core state) when the quadrangular rotating body 20 is rotated 90 degrees.

As described above, in the injection molding machine according to the present invention, the first and second phase cores are rotated by 90 degrees while rotating the turntable 20 having a turntable shape in which four lower cores 30 to 33 are arranged in the circumferential direction to form a 90 degree interval. When the mold opening and closing (60) (70), the first molded article molding step (S10), the drawing printing step (S20), the second molded article molding step (S30), the heterogeneous that is not fused to each other through the molded article taking out step (S40) The double molded article 1 formed by combining the resins is automatically produced continuously.

In addition, after forming the primary molded article 1a forming the exterior of the molded article, the coating device 100 may be applied to the inner surface of the primary molded article 1a to form a design 1c, thereby improving production workability. Of course, since the design 1c is formed on the inner surface of the primary molded product 1a, it is not erased during product use. In particular, since the transparent adhesive layers 1d and 1e are formed on the inner surface of the primary molded product 1a, the secondary molded product 1b is molded more firmly on the inner surface of the primary molded product 1a.

On the other hand, in the embodiment of the present invention was described as molding the primary molded product (1a) using a transparent molten resin as a raw material, it can be molded even through a translucent molten resin, of course, even in this case directly marking (printing) The illustrated design 1c can be implemented to be clearly visible.

In addition, although the embodiment of the present invention has been described as molding the secondary molded product 1b by injecting an opaque molten resin, the present invention is not limited thereto, and a variety of products may be realized by injecting and molding a fluorescent opaque molten resin.

1 is a perspective view showing a double molded article manufactured by an injection molding machine according to the present invention.

2 is an exploded view of a double molded article manufactured by an injection molding machine according to the present invention.

Figure 3 is a perspective view schematically showing an injection molding machine capable of automatic production of a double molded article according to the present invention.

Figure 4 is a side cross-sectional view taken along the line IV-IV of Figure 3, schematically showing the structure of the rotating mold and the movable plate of the injection molding machine according to the present invention.

Figure 5 shows an extract of the rotating mold and the marking device disposed on the base of the injection molding machine according to the present invention.

Figure 6 is a block diagram showing a step-by-step method of manufacturing a double molded article through an injection molding machine according to the present invention.

Figure 7 shows the mold closing operation state of the injection molding machine according to the present invention.

Figure 8 shows the mold opening operation state of the injection molding machine according to the present invention.

* Description of the symbols for the main parts of the drawings *

10. Base 20. Rotating plate

30 ~ 33.Harcore 40.Moving version

50..Thai 60..First Phase Core

70. 2nd phase core 80. Rotary drive means

100 .. Marking device S10 .. 1st molded part molding step

S20..Design print step S30 .. Second molded part molding step

S40 .. Blowing out the molded article

Claims (8)

In the injection molding machine capable of automatic production of a double-molded article capable of continuously injection molding the double-molded article (1) made of the outside and the inside through different dissimilar materials; The injection molding machine; A circular rotating plate 20 disposed on the base 10 of the injection molding machine so as to be rotated 360 degrees in a turntable manner; Four lower cores 30 to 33 arranged in a circumferential direction to form an interval of 90 degrees from an upper surface of the rotatable plate 20 and for injection molding the primary molded product 1a forming the outside of the double molded product 1; A movable plate (40) disposed in the upper portion of the base (10) to enable vertical movement through the tie bar (50) and moving through the cylinder unit (41); It is disposed on one side of the bottom surface of the movable die 40 and mated with the lower core 30 facing one side of the bottom surface of the movable die 40 among the lower cores 30 to 33 when the movable die 40 descends. A first phase core 60 to form a first cavity for injection molding the primary molded product 1a; The second upper core 60 is disposed on the other side of the bottom of the movable die 40 spaced apart by a predetermined distance, and is combined with the lower core 32 facing the other side of the bottom of the movable die plate of the double molded article (1) A second phase core 70 for forming a second cavity for injection molding the secondary molded article 1b constituting the inside into an inner surface of the primary molded article 1a; When the first and second phase cores 60 and 70 are respectively joined to opposite lower cores 30 and 32 and the primary and secondary molded articles 1a and 1b are molded and then opened, Rotating driving means 80 for rotating the rotating plate 20 at intervals of 90 degrees; The first upper core 60 and the lower core 30 are combined to form the primary molded product 1a, and the second upper core 70 and the lower core 32 are combined to form the secondary molded product 1b. A molding apparatus 100 for printing marking the pattern 1c on the inner surface of the primary molded product 1a exposed in the state formed in the lower core 31 of the rotatable plate 20 during molding; Injection molding machine capable of automatic production of a double molded article, characterized in that provided. The method of claim 1, The marking device 100 is; A print head (110) for directly printing and marking the pattern (1c) on an inner surface of the primary molded product (1a); An adhesive nozzle 120 for spray coating a transparent adhesive on an inner surface of the primary molded product 1a; Hot air nozzle 130 for hot air drying the inner surface of the primary molded product (1a); Injection molding machine capable of automatic production of a double molded article, characterized in that provided. The method according to claim 1 or 2, The marking device 100 is; Injection molding machine capable of automatic production of a double-molded product, characterized in that the laser marking machine for laser marking the pattern directly on the inner surface of the primary molded product (1a). The method of claim 1, The marking device 100 is; An injection molding machine capable of automatically producing a double molded product, characterized in that the screen printing machine for directly screen printing the pattern on the inner surface of the primary molded product (1a). The method of claim 1, After forming the secondary molded product 1b in the second phase core 70, when the movable plate 40 is separated from the rotatable plate 20 side, the eject rod for dropping out the double molded product 1. An injection molding machine capable of automatically producing a double molded article, characterized in that 72 is provided. Four lower cores 30 to 33 for injection molding the primary molded product 1a forming the exterior of the double molded product 1 are disposed in the circumferential direction to form a 90 degree interval on the upper surface, and the base 10 of the injection molding machine is A rotatable plate 20 disposed above the turntable in a turntable manner; A movable plate (40) disposed in the upper portion of the base (10) through a tie bar (50) and movable through the cylinder unit (41); It is disposed on one side of the bottom surface of the movable die 40 and mated with the lower core 30 facing one side of the bottom surface of the movable die 40 among the lower cores 30 to 33 when the movable die 40 descends. A first phase core 60 to form a first cavity for injection molding the primary molded product 1a; The double molded article is disposed on the other side of the bottom surface of the movable die plate 40 so as to be spaced apart from the first phase core 60 by a lower core 32 facing the other side of the bottom surface of the movable die plate 40. A second phase core 70 forming a second cavity for injection molding the secondary molded product 1b forming the inside of 1) to be integrated with the inner surface of the primary molded product 1a; When the first and second phase cores 60 and 70 are respectively joined to opposite lower cores 30 and 32 and the primary and secondary molded articles 1a and 1b are molded and then opened, Rotating driving means 80 for rotating the rotating plate 20 at intervals of 90 degrees; The first upper core 60 and the lower core 30 are combined to form the primary molded product 1a, and the second upper core 70 and the lower core 32 are combined to form the secondary molded product 1b. A molding apparatus 100 for printing marking the pattern 1c on the inner surface of the primary molded product 1a exposed in the state formed in the lower core 31 of the rotatable plate 20 during molding; In the manufacturing method for continuously injection molding the double molded article (1) through the injection molding machine provided; The first upper core 60 of the movable die 40 and the lower core 30 disposed on the rotatable die 20 are combined to inject the primary molded product 1a into the lower core 30. Forming a primary molded product (S10); After the primary molded product molding step (S10) to rotate the rotary die 20 by 90 degrees through the rotary drive means 80 so that the primary molded product (1a) side close to the marking device 100, A printing step (S20) for printing and marking a drawing (1c) on an inner surface of the primary molded product (1a); After the pattern printing step S20, the rotatable plate 20 is rotated 90 degrees through the rotation driving means 80 to move the first molded article 1a on which the pattern 1c is printed. Secondary molded article 1b which faces the second phase core 70 of 40 and joins the second phase core 70 to form the inside of the double molded article 1 on the inner surface of the primary molded article 1a. Second molded article molding step (S30) for injection molding to be integrated; After the second molded article molding step (S30), the molded article taking out step (S40) for taking out the double molded article (1) while separating the movable mold 40 from the rotating mold 20; Dual molded article manufacturing method using an injection molding machine comprising a. The method of claim 6, In the primary molded article molding step (S10), the transparent molded resin is injected into the first cavity formed between the first upper core 60 and the lower core 30 to mold the primary molded article 1a; In the secondary molded article molding step (S30), the second molded article 1b is formed by injecting an opaque molten resin into a second cavity formed between the second upper core 70 and the lower core 32. Dual molded article manufacturing method using an injection molding machine. The method of claim 6, The pattern printing step (S20); An adhesive primary spraying step (S21) for spray-spraying a transparent adhesive (1d) on the inner surface of the primary molded product (1a); A pattern printing process (S22) for printing the pattern (1c) on the inner surface of the primary molded product (1a) after the adhesive primary spraying process (S21); An adhesive secondary spraying step (S23) of spraying and applying a transparent adhesive (1e) to an inner surface of the primary molded product (1a) after the printing process (S22); And a drying step (S24) for drying the inner surface of the primary molded product (1a) by blowing hot air after the secondary spraying step (S23).

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